My wife went to update her site and got the white screen of death when she logged into her dashboard. The site displayed fine but the dashboard was just a white screen.
Following advice I have seen elsewhere I disabled all plugins and re-enabled them one-by-one. As soon as the Yoast plugin was re-enabled, the dashboard screen went white. The Yoast SEO plugin was just updated and I suspect that update broke her dashboard.
I am not requesting advice. Just letting others know that if you encounter the same problem and are using the Yoast SEO plugin, that should be the first place to look.
I understand why Yoast would not want to be contacted directly but I would have let him know about the problem privately so he could address it. Instead he will find out about it along with everyone else.
Now I need to find an alternate SEO plugin.